Greenheck Fan PVE-35, PVE-55, PVE-20, PVE-45 manual Roof Curb and Rail Mounting, Service Clearances

Roof Curb and Rail Mounting

Service Clearances

When installed on a roof, a typical installation will include at least one roof penetration in order to deliver return air to the unit from the space. Additionally, a second roof penetration may be used for supply air discharge to the space.

Intake and Discharge Options

Option	Bottom	Top	Side	End
OA Intake				X

CLEARANCE

B

C

A

D

CLEARANCE

	SA Discharge			X							X
	RA Intake			X
	EA Discharge										X
	OA - Outdoor Air
	SA - Supply Air (to the space)
	RA - Return Air (from the space)
	EA - Exhaust Air
							B		EA Discharge
				SA Discharge
						A
										SA Discharge
								C		D
	OA Intake				E
						F
	RA Intake
Duct Dimensions
	Model		A	B		C		D			E	F
	PVe-20	10.7		12.2		10.3		11.8			22.0	14.0
		(280)		(310)		(270)		(300)			(570)	(360)
	PVe-35	11.9		13.7		11.4		13.1			34.0	14.0
		(310)		(350)		(290)		(340)			(870)	(360)
	PVe-45	14.1		16.0		13.3		14.5			46.0	14.0
		(360)		(410)		(340)		(370)			(1170)	(360)
	PVe-55	16.4		19.2		15.9		18.6			60.0	14.0
		(420)		(490)		(450)		(480)			(1530)	(360)

All dimensions are shown in inches (millimeters).

Position the unit roof opening such that the Return Air Intake will line up with the corresponding ductwork.

If applicable, adjust position to also accommodate the SA Discharge vent. Make certain that proposed positioning of the unit still maintains recommended service clearances.

D

Model	A	B	C	D
PVe-20	36	36	36	60
	(920)	(920)	(920)	(1530)
PVe-35	48	36	36	60
	(1220)	(920)	(920)	(1530)
PVe-45	60	36	36	60
	(1530)	(920)	(920)	(1530)
PVe-55	72	36	36	60
	(1830)	(920)	(920)	(1530)

All dimensions are shown in inches (millimeters). The weatherhoods include 2-inch aluminum mesh filters that are removed out of the end of the hood as shown in this drawing and require extra clearance for removal.

Do not face the Outdoor Air Intake of the unit into prevailing wind and also keep the air intake away from any other exhaust fans. Likewise, position the Exhaust Air Discharge opening away from any other outdoor air intakes of other equipment.

When cutting duct openings, cut opening one inch larger (25 mm) than duct size to allow clearance for installation. Area enclosed by roof curb must comply with clearance to combustible materials. If the roof is constructed of combustible materials, area within the roof curb must be ventilated, left open or covered with non-combustible material which has an “R” value of at least five (5). If area within curb is left open, higher radiated sound levels may result.

Where the supply or warm air duct passes through a combustible roof, a clearance of one inch must be maintained between the outside edges of the duct and combustible material in accordance with NFPA Standard 90A.

Model PVe Heat Recovery Unit 5